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connect two heads !

Do NOT connect two heads to one cab. You'll wreck the output circuitry of both heads.

You can take a line/DI out of one head into the other (preferably into the FX return / line in socket, otherwise keep the gain control very low) and connect each head to a separate cab.
 
Originally posted by Mickey Shane
Series. Run a speaker out jack of the first amp (hopefully, solid state)into the instrument input of the second amp. Now you have a really hot preamp. There should be alot of unwanted noise. And, the second amp might fail at some point. But, you have to ask yourself... - "What would Jimi do"?

NEVER, I repeat NEVER DO A STUPID THING LIEK THAT.


Line out -> Line in

or FX send (amp1) -> FX return (amp2)


You also cannot use 2 head with one cab.
 
Well I have a Mesa 400+ and a Mesa D-180 and I was just curious if I could hook them up to one cab each, by using the slave out. I own a split 1/4 inch Y cable and thats the easiest solution I know. But I was wondering what a slave out does. Not that I would ever use it, but it would be fun to find out.
 
A slave out would go into a power amp (or power amp in of a head). I believe a true series return also works so you bypass the pre. What you don't want to do is pre-amp a pre-amp.

Some run a set of speakers with a head/amp and then go slave out or pre out, to a power amp or power amp in of a head. Then the second amp is running another set of speakers. The second is just power. The pre-amp (tone control) is from the first amp.